WO2017130499A1 - Device and method - Google Patents

Abstract

The present invention makes possible the application of a filter in a more suitable embodiment, said filter being for improving frequency usage efficiency. This device comprises a communication unit that performs wireless communication and a control device that provides control such that control information is transmitted to an external device via said wireless communication, said control information relating to a resource that applies a filter for limiting the width of a guard band within a frequency band that is used for said wireless communication.

Description

Apparatus and method

The present disclosure relates to an apparatus and a method.

In OFDMA (Orthogonal Frequency-Division Multiple Access) and SC-FDMA (Single-Carrier Frequency-Division Multiple Access) adopted in LTE (Long Term Evolution) / LTE-A (Advanced), radio resources (for example, resource blocks) ) Are assigned to users without duplication. In a wireless communication system employing OFDMA or SC-FDMA, a part of the frequency band (OOB: Out Of Band) that is not used for data transmission is used to reduce the power leaked to the adjacent system. It may be used as a guard band. For example, Patent Literature 1 discloses an example of a wireless communication system that uses a part of a frequency band as a guard band.

Also, in recent years, as one of the technologies that can be expected to improve the frequency utilization efficiency among the radio access technologies (RAT) of the fifth generation (5G) mobile communication systems following LTE / LTE-A, New Waveform technology is drawing attention. New Waveform technology is a technology that cuts leakage power and improves frequency utilization efficiency by applying a filter to the transmission signal waveform. By applying the New Waveform technology, it is expected that the OOB signal is attenuated, the frequency bandwidth used as a guard band is further limited, and thus the frequency utilization efficiency is improved.

Japanese Patent Laying-Open No. 2015-46901

On the other hand, when the New Waveform technology is supported, it may be desirable that the filter can be applied in a more suitable manner depending on the transmission / reception environment and use case.

Therefore, the present disclosure proposes an apparatus and a method that can apply a filter for improving frequency utilization efficiency in a more preferable manner.

According to the present disclosure, control information related to a resource to which a filter for limiting the width of a guard band out of a frequency band used for wireless communication and a communication unit that performs wireless communication is transmitted via the wireless communication. And a control unit that controls to be transmitted to the external device.

In addition, according to the present disclosure, control information related to a resource to which a filter for limiting the width of a guard band out of a frequency band used for wireless communication and a communication unit that performs wireless communication is transmitted to the wireless communication. And an acquisition unit for acquiring from an external device.

In addition, according to the present disclosure, based on control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for wireless communication and a communication unit that performs wireless communication is applied, the filter is And a control unit that controls the transmission data applied to the transmission data to be transmitted to the external device via the wireless communication.

Further, according to the present disclosure, control information related to resources for performing wireless communication and a resource to which a processor applies a filter for limiting a guard band width among frequency bands used for the wireless communication is the wireless communication. Controlling to be transmitted to an external device via communication;
A method is provided comprising:

Also, according to the present disclosure, control information regarding resources for performing wireless communication and a resource to which a processor applies a filter for limiting the width of a guard band among frequency bands used for the wireless communication is provided. Obtaining from an external device via communication.

Further, according to the present disclosure, based on control information regarding resources to perform wireless communication and a resource to which a processor applies a filter for limiting a guard band width among frequency bands used for the wireless communication, Applying a filter to transmission data and controlling the transmission data to which the filter is applied to be transmitted to an external device via the wireless communication.

As described above, according to the present disclosure, there is provided an apparatus and a method that can apply a filter for improving frequency use efficiency in a more preferable manner.

Note that the above effects are not necessarily limited, and any of the effects shown in the present specification, or other effects that can be grasped from the present specification, together with or in place of the above effects. May be played.

It is explanatory drawing for demonstrating the outline | summary of New Waveform technology. It is explanatory drawing for demonstrating the outline | summary of New Waveform technology. 2 is an explanatory diagram for describing an example of a schematic configuration of a system according to an embodiment of the present disclosure. FIG. It is a block diagram which shows an example of a structure of the base station which concerns on the same embodiment. It is a block diagram which shows an example of a structure of the terminal device which concerns on the same embodiment. It is explanatory drawing for demonstrating an example of the process in the transmitter which supports New Waveform technology. It is explanatory drawing for demonstrating an example of the process in the transmitter which supports New Waveform technology. It is explanatory drawing for demonstrating an example of the process in the transmitter which supports New Waveform technology. It is explanatory drawing for demonstrating an example of the process in the transmitter which supports New Waveform technology. It is explanatory drawing for demonstrating an example of the process in the receiver which supports New Waveform technology. It is explanatory drawing for demonstrating an example of a structure of a resource block. It is explanatory drawing for demonstrating an example of a structure of a resource block. It is explanatory drawing for demonstrating an example of a structure of a resource block. It is the flowchart shown about an example of the flow of a series of processes which concern on the determination of the application unit of a filter. It is the flowchart shown about an example of the flow of a series of processes concerning switching of the application unit of a filter. It is a block diagram which shows the 1st example of schematic structure of eNB. It is a block diagram which shows the 2nd example of schematic structure of eNB. It is a block diagram which shows an example of a schematic structure of a smart phone. It is a block diagram which shows an example of a schematic structure of a car navigation apparatus.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
1. 1. Introduction 1.1. New Waveform technology 1.2. Technical issues Configuration example 2.1. System configuration example 2.2. Configuration example of base station 2.3. 2. Configuration example of terminal device Technical features 4. Application example 4.1. Application examples related to base stations 4.2. 4. Application examples related to terminal devices Conclusion

<< 1. Introduction >>
<1.1. New Waveform Technology>
First, an outline of the New Waveform technology will be described with reference to FIGS. 1 and 2. 1 and 2 are explanatory diagrams for explaining the outline of the New Waveform technology.

In OFDMA (Orthogonal Frequency-Division Multiple Access) and SC-FDMA (Single-Carrier Frequency-Division Multiple Access) adopted in LTE and LTE-A, radio resources (for example, resource blocks) are allocated to users without duplication. It is done. For example, FIG. 1 shows an example of a frequency domain power spectrum of a transmission signal when OFDMA is applied. In FIG. 1, the horizontal axis indicates the frequency band in the subcarrier, and the vertical axis indicates the transmission power.

In the waveform of the transmission signal shown in FIG. 1, the frequency band indicated by the reference symbol W11 indicates the frequency band used for data transmission (except for the NULL subcarrier), and the other frequency bands are OOB (Out Of Band) not used for data transmission. In addition, at least a part of the frequency band of the OOB may be provided as a guard band for reducing power leaking to the adjacent system. For example, when the guard band is not provided, the power is attenuated to about −20 dB to −30 dB by providing the guard band even when the power of the subcarrier with the largest power in the OOB is about −10 dB. It becomes possible to make it.

By using such a mechanism, LTE / LTE-A reduces interference caused by leakage power to adjacent systems by providing guard bands on both sides of the frequency band used for data transmission.

On the other hand, since the guard band uses a part of the frequency band as an unused band (that is, it is not used for data transmission), the frequency use efficiency may be reduced. As a specific example, when the channel width is 20 MHz, approximately 2 MHz (1 MHz on one side) is assigned as a guard band, and in this case, the frequency utilization efficiency is reduced by about 10%.

Therefore, among the radio access technologies (Radio Access Technology: RAT) of the fifth generation (5G) mobile communication system following LTE / LTE-A, the New Waveform technology is one of the technologies that can be expected to improve the frequency utilization efficiency. Is attracting attention. New Waveform technology is a technology that cuts leakage power and improves frequency utilization efficiency by applying a filter to the transmission signal waveform. For example, FIG. 2 shows an example of a frequency domain power spectrum of the transmission signal when a Dorf Chebychev filter is applied to the transmission signal shown in FIG. 2 is the same as the example shown in FIG. In FIG. 2, the waveform of the transmission signal before applying the filter (that is, the waveform shown in FIG. 1) is also shown for reference.

As shown in FIG. 2 as the waveform of the transmission signal after applying the filter, it can be seen that the power applied to the OOB is reduced by applying the filter. In this way, by applying the New Waveform technology (that is, applying a filter to the transmission signal), the OOB signal is attenuated, the frequency bandwidth used as a guard band is further limited, and thus the frequency It is expected to improve usage efficiency.

If the frequency bandwidth used as a guard band can be further limited, the type of filter applied to the transmission signal is not necessarily limited to the Dorf Chebyshev filter as shown in FIG. As a specific example, a so-called Nyquist filter such as a root raised cosine filter may be applied as a filter for realizing the New Waveform technology. Further, the filter applied to the transmission signal is not necessarily limited to a single filter, and a filter applied from a plurality of filters may be adaptively selected. For example, the aforementioned Dorfchebyshev filter or root raised cosine filter may be selectively applied depending on the situation. In the following description, when simply described as “filter”, a filter for further limiting the frequency bandwidth used as a guard band is used as in the above-described filter unless otherwise specified. Shall be shown.

The outline of the New Waveform technology has been described above with reference to FIGS.

<1.2. Technical issues>
Next, a technical problem according to an embodiment of the present disclosure will be described.

As described above, the New Waveform technology makes it possible to reduce the leakage power to the OOB by applying a filter (for example, a Dorf Chebyshev filter) to the transmission signal. In supporting such New Waveform technology, it is desirable that the filter is applied in a more suitable manner according to the transmission / reception environment and use case. In particular, when applying the above-described filter, for example, depending on whether the filter is applied with a series of resource elements as one unit or the filter is applied in a finer unit, transmission / reception processing amount and filter application The characteristics of subsequent signals may be different. Therefore, for example, a method for determining a unit to which a filter is applied and a method for transmitting the determined unit to another device are important examination issues in supporting the New Waveform technology.

Therefore, in the present disclosure, as an example of a mechanism for making it possible to apply a filter for improving frequency utilization efficiency in a more preferable aspect, in particular, a method for determining a unit to which a filter is applied, and a method for transmitting the unit. This will be explained with a focus on.

<< 2. Configuration example >>
<2.1. System configuration example>
First, an example of a schematic configuration of the system 1 according to an embodiment of the present disclosure will be described with reference to FIG. FIG. 3 is an explanatory diagram for describing an example of a schematic configuration of the system 1 according to an embodiment of the present disclosure. As illustrated in FIG. 3, the system 1 includes a wireless communication device 100 and a terminal device 200. Here, the terminal device 200 is also called a user. The user may also be referred to as a UE. The wireless communication device 100C is also called UE-Relay. The UE here may be a UE defined in LTE or LTE-A, and the UE-Relay may be Prose UE to Network Relay as discussed in 3GPP, and more generally It may mean equipment.

(1) Wireless communication device 100
The wireless communication device 100 is a device that provides a wireless communication service to subordinate devices. For example, the wireless communication device 100A is a base station of a cellular system (or mobile communication system). The base station 100A performs wireless communication with a device (for example, the terminal device 200A) located inside the cell 10A of the base station 100A. For example, the base station 100A transmits a downlink signal to the terminal device 200A and receives an uplink signal from the terminal device 200A.

The base station 100A is logically connected to other base stations through, for example, an X2 interface, and can transmit and receive control information and the like. The base station 100A is logically connected to a so-called core network (not shown) by, for example, an S1 interface, and can transmit and receive control information and the like. Note that communication between these devices can be physically relayed by various devices.

Here, the radio communication device 100A shown in FIG. 3 is a macro cell base station, and the cell 10A is a macro cell. On the other hand, the wireless communication devices 100B and 100C are master devices that operate the small cells 10B and 10C, respectively. As an example, the master device 100B is a small cell base station that is fixedly installed. The small cell base station 100B establishes a wireless backhaul link with the macro cell base station 100A and an access link with one or more terminal devices (for example, the terminal device 200B) in the small cell 10B. Note that the wireless communication device 100B may be a relay node defined by 3GPP. The master device 100C is a dynamic AP (access point). The dynamic AP 100C is a mobile device that dynamically operates the small cell 10C. The dynamic AP 100C establishes a radio backhaul link with the macro cell base station 100A and an access link with one or more terminal devices (for example, the terminal device 200C) in the small cell 10C. The dynamic AP 100C may be, for example, a terminal device equipped with hardware or software that can operate as a base station or a wireless access point. The small cell 10C in this case is a locally formed network (Localized Network / Virtual Cell).

The cell 10A may be operated in accordance with any wireless communication scheme such as LTE, LTE-A (LTE-Advanced), GSM (registered trademark), UMTS, W-CDMA, CDMA200, WiMAX, WiMAX2, or IEEE 802.16, for example. .

Note that the small cell is a concept that can include various types of cells (for example, femtocells, nanocells, picocells, and microcells) that are smaller than the macrocells and that are arranged so as to overlap or not overlap with the macrocells. In one example, the small cell is operated by a dedicated base station. In another example, the small cell is operated by a terminal serving as a master device temporarily operating as a small cell base station. So-called relay nodes can also be considered as a form of small cell base station. A wireless communication device that functions as a master station of a relay node is also referred to as a donor base station. The donor base station may mean a DeNB in LTE, and more generally may mean a parent station of a relay node.

(2) Terminal device 200
The terminal device 200 can communicate in a cellular system (or mobile communication system). The terminal device 200 performs wireless communication with a wireless communication device (for example, the base station 100A, the master device 100B, or 100C) of the cellular system. For example, the terminal device 200A receives a downlink signal from the base station 100A and transmits an uplink signal to the base station 100A.

(3) Supplement Although the schematic configuration of the system 1 has been described above, the present technology is not limited to the example illustrated in FIG. For example, as a configuration of the system 1, a configuration that does not include a master device, an SCE (Small Cell Enhancement), a HetNet (Heterogeneous Network), an MTC (Machine Type Communication) network, or the like may be employed.

<2.2. Example of base station configuration>
Subsequently, a configuration of the base station 100 according to an embodiment of the present disclosure will be described with reference to FIG. FIG. 4 is a block diagram illustrating an exemplary configuration of the base station 100 according to an embodiment of the present disclosure. Referring to FIG. 4, the base station 100 includes an antenna unit 110, a radio communication unit 120, a network communication unit 130, a storage unit 140, and a processing unit 150.

(1) Antenna unit 110
The antenna unit 110 radiates a signal output from the wireless communication unit 120 to the space as a radio wave. Further, the antenna unit 110 converts radio waves in space into a signal and outputs the signal to the wireless communication unit 120.

(2) Wireless communication unit 120
The wireless communication unit 120 transmits and receives signals. For example, the radio communication unit 120 transmits a downlink signal to the terminal device and receives an uplink signal from the terminal device.

(3) Network communication unit 130
The network communication unit 130 transmits and receives information. For example, the network communication unit 130 transmits information to other nodes and receives information from other nodes. For example, the other nodes include other base stations and core network nodes.

(4) Storage unit 140
The storage unit 140 temporarily or permanently stores a program for operating the base station 100 and various data.

(5) Processing unit 150
The processing unit 150 provides various functions of the base station 100. The processing unit 150 includes a communication processing unit 151 and a notification unit 153. The processing unit 150 may further include other components other than these components. That is, the processing unit 150 can perform operations other than the operations of these components.

The operations of the communication processing unit 151 and the notification unit 153 will be described in detail later.

<2.3. Configuration example of terminal device>
Next, an example of a configuration of the terminal device 200 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 5 is a block diagram illustrating an exemplary configuration of the terminal device 200 according to the embodiment of the present disclosure. As illustrated in FIG. 5, the terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230, and a processing unit 240.

(1) Antenna unit 210
The antenna unit 210 radiates the signal output from the wireless communication unit 220 to the space as a radio wave. Further, the antenna unit 210 converts a radio wave in the space into a signal and outputs the signal to the wireless communication unit 220.

(2) Wireless communication unit 220
The wireless communication unit 220 transmits and receives signals. For example, the radio communication unit 220 receives a downlink signal from the base station and transmits an uplink signal to the base station.

(3) Storage unit 230
The storage unit 230 temporarily or permanently stores a program for operating the terminal device 200 and various data.

(4) Processing unit 240
The processing unit 240 provides various functions of the terminal device 200. For example, the processing unit 240 includes an information acquisition unit 241, a communication processing unit 243, and a notification unit 245. Note that the processing unit 240 may further include other components other than these components. That is, the processing unit 240 can perform operations other than the operations of these components.

The operations of the information acquisition unit 241, the communication processing unit 243, and the notification unit 245 will be described in detail later.

<< 3. Technical features >>
Subsequently, technical features of the present disclosure will be described.

(1) Processing in Each Device (a) Processing in Transmission Device First, an example of processing in a transmission device that supports the New Waveform technology will be described with reference to FIGS. 6, 7, and 8A. 6, 7, and 8 </ b> A are explanatory diagrams for explaining an example of processing in the transmission device that supports the New Waveform technology. As shown in FIG. 6, FIG. 7, and FIG. 8A, a bit stream (for example, a transport block) for each user is processed. For this bit stream for each user, several processes such as CRC (Cyclic Redundancy Check) coding, FEC (Forward Error Correction) coding, rate matching and scrambling / interleaving as shown in FIG. ) Is performed, and then modulation is performed. Then, as shown in FIG. 7, layer mapping, power allocation, precoding, and resource element mapping are performed on the modulated bit stream, and a bit stream for each antenna element is output.

The bit stream for each antenna is divided into units determined on the basis of at least one of the size in the frequency direction and the time direction (in other words, the number of resources) with the resource element as a minimum unit. At this time, each unit includes one or more resource elements. Then, for each unit, filter processing for further limiting the frequency bandwidth used as a guard band is performed. The unit corresponds to a unit to which a filter is applied (hereinafter also referred to as “filter application unit”). For example, in the example shown in FIG. 8A, each resource element constituting the resource block is divided into B units of 0 to B−1, and processing related to the application of the filter is executed for each unit. Specifically, the bit stream for each antenna is subjected to IFFT or IDFT processing for each unit and then subjected to filter processing. The method for determining the application unit of the filter will be described later in detail.

Then, the bit streams for each unit subjected to the filter processing are added to each other, and after being added with a guard interval as necessary, conversion from digital to analog and RF (Radio Frequency) is performed. Transmitted from each antenna.

In addition, each process in the transmission apparatus mentioned above may be performed based on control by a predetermined control unit (for example, PHY Configuration Controller in the figure).

In the above description, the example in which the filter is applied in the time domain to the bit stream (that is, the transmission signal) for each antenna has been described. However, the filter may be applied to the bit stream in the frequency domain. . For example, FIG. 8B is an explanatory diagram for explaining an example of processing in a transmission device that supports the New Waveform technology, and shows an example of applying a filter in the frequency domain to a bit stream for each antenna. . In this case, as shown in FIG. 8B, after performing the filtering process for each unit on the bit stream for each antenna, the IFFT or IDFT process may be performed on the unit after the filtering process. The subsequent processing is the same as the case of applying the filter in the time domain shown in FIG. 8A.

(B) Processing in Receiving Device Next, an example of processing in the receiving device that supports the New Waveform technology will be described with reference to FIG. FIG. 9 is an explanatory diagram for explaining an example of processing in a receiving apparatus that supports the New Waveform technology.

As shown in FIG. 9, RF and analog to digital conversion, zero padding, DFT (Discrete Fourier Transform) / FFT (Fast Fourier Transform), downsampling, etc. Processing such as conversion and decoding is performed. Note that in a receiving apparatus that supports the New Waveform technology, the reverse processing of the filter processing based on the New Waveform technology is performed during equalization and decoding. As a result, a bit stream (for example, a transport block) of each user is obtained. The detailed contents of the reception process will be separately described later together with the description of the received signal.

Further, each process in the above-described receiving apparatus may be executed based on control by a predetermined control unit (for example, PHY Configuration Controller in the drawing).

(2) Transmission signal and reception signal Next, a transmission signal and a reception signal when the New Waveform technology is supported will be described. In this description, a multi-cell system such as HetNet (Heterogeneous Network) or SCE (Small Cell Enhancement) is assumed. Also, in this description, the description corresponding to the subcarrier and the index corresponding to the symbol, sample, slot, and subframe are omitted unless otherwise specified.

The reception devices as the transmission targets and u, the number of transmission antennas in the transmitter for transmitting a signal to the receiving device to N _t. Each transmission antenna is also referred to as a “transmission antenna port”. Here, the transmission signal to the receiving device u can be expressed in a vector format as shown in (Equation 1) below.

In (Equation 1) described above, N represents the FFT size length. N _f indicates the filter length, and B indicates the number of subbands to which the filter is applied. N _t represents the number of transmission antennas, and N _SS represents the number of spatial transmission streams. Further, vector S _{u, b} is a spatial stream signal of subband b in receiving apparatus u. Each element of the vector S _{u, b} basically corresponds to a digital modulation symbol such as PSK or QAM. Here, for example, when subband b = 0 is a set of subcarriers from 0th to k−1, the following condition (Equation 2) is satisfied.

W _{u, b} is a precoding matrix for subband b of receiving apparatus u. P _{u, b} is a power allocation coefficient matrix in subband b of receiving apparatus u. Note that each element of the matrix P _{u, b} is preferably a positive real number. The matrix P _{u, b} may be a so-called diagonal matrix (that is, a matrix in which components other than the diagonal component are zero). For example, the matrix P _{u, b} is expressed as (Equation 3) shown below.

When adaptive power allocation is not performed for the spatial stream, the scalar value P _{u, b} may be used instead of the matrix P _{u, b} .

The vector F is an FFT matrix of size N, and the vector G _{u, b} is a linear convolution matrix of a filter applied to the subband _b of the receiving device u. The vector Ω _{u, b} corresponds to insertion of a guard interval (GI) section. I _N in Ω _{u, b} is a unit matrix of size N, and N _GI is the section length of the guard interval.

Further, in case of receiving a transmission signal of the transmission antenna #n _t by the receiving antenna #n _r, the received signal received by the receiving apparatus u _{r u, nt,} when the _nr, the received signal _{r u, nt, nr} is It is expressed as (Equation 4) shown below.

In the above (Equation 4), L _h indicates the number of transmission path paths. The matrices _{hu, nt, and nr} are channel response matrices between the transmission antenna n _t and the reception antenna n _r . Note that each element of the matrix _{hu, nt, nr} is basically a complex number. The vectors n _{u and nr} indicate the noise of the receiving antenna n _r of the receiving device u. Note that the noise n _{u, nr} includes, for example, thermal noise and interference from other systems other than the system that is the subject of the present disclosure. Note that the average power of noise is represented by σ _{n, u} ² .

In addition, when the New Waveform technology is supported, the above-described received signals _{ru, nt, nr} correspond to signals to which the above-described filters _{Gu, b} are applied. Therefore, in the process of _performing DFT / FFT and equalization and decoding processes on the received signals _{ru, nt, and nr} , the reverse process of the process of applying the filter _{Gu, b} described above is performed.

Specifically, the received signal r _{u, nt, nr,} the filter G _u described _above, with the application of _b, the filter G _u, filter length amount corresponding signal length of _b (in other words, the number of samples symbols) increased is doing. For this reason, the receiving device u, when processing the DFT / FFT for the received signals _{ru, nt, nr} (that is, at the time of OFDM decoding), in addition to the IFFT size at the time of transmission processing, It is necessary to consider the size of the delay. Therefore, the receiving apparatus u is, for example, the received signal _{r u, nt,} by implementing the zero-padding since the end of _nr, the received signal _{r u, nt,} signal length of _nr is adjusted to be 2N.

Next, the receiving apparatus u converts the received signal _{ru, nt, nr} subjected to zero padding into a frequency domain signal by applying a DFT / FFT of size 2N, and the converted signal Apply 1/2 downsampling. By such processing, the signal length of the reception signal adjusted to 2N by performing zero padding is adjusted to N by 1/2 downsampling.

The receiving device u can decode the transmitted spatial stream signal by performing frequency domain equalization on the down-sampled received signal. For example, MMSE (Minimum Mean Square Error) weights are conventionally generated in consideration of the channel matrix _{hu, nt, nr} , the precoding matrix W _{u, b} , and the noise power σ _{n, u} ² . On the other hand, when the New Waveform technology is supported as in the present disclosure, equalization weights are created in consideration of the filter matrix _{Gu, b} applied in the transmission signal processing in addition to the above. Will be.

The transmission signal and reception signal when the New Waveform technology is supported have been described above.

(3) Filter Application Unit Next, the filter application unit will be described in more detail with reference to FIGS. As described above, the application unit (in other words, the above-described unit) of the filter for further limiting the frequency bandwidth used as the guard band is at least one of the frequency direction and the time direction with the resource element as the minimum unit. Is determined based on the size (in other words, the number of resources). More precisely, the application unit of the filter is determined with the minimum time-frequency unit used for transmission as the minimum unit to which the filter is applied.

For example, in the case of LTE / LTE-A, one symbol on one subcarrier is defined as a resource element, and the application unit of the filter is determined with the resource element as a minimum unit. In LTE / LTE-A, the configuration of resource blocks (in other words, a method of dividing resource blocks into resource elements) assumes three cases as shown in FIGS. , Resource element sizes (that is, a band of one subcarrier and a symbol length of one symbol) are different. 10 to 12 are explanatory diagrams for explaining an example of the configuration of the resource block.

For example, FIG. 10 shows an example of the configuration of a resource block when the number of symbols is 7 and the number of subcarriers is 12. In this case, the band of one subcarrier is 15 kHz, and the symbol length of one symbol is 2208 Ts or 2192 Ts when Ts = 1/30720 [ms]. That is, in the example shown in FIG. 10, the minimum unit to which the filter is applied is 15 kHz × 2208 Ts (in the case of # 0 symbol).

FIG. 11 shows an example of a resource block configuration when the number of symbols is 6 and the number of subcarriers is 12. In this case, the band of one subcarrier is 15 kHz, and the symbol length of one symbol is 2560 Ts. That is, in the example shown in FIG. 11, the minimum unit to which the filter is applied is 15 kHz × 2560 Ts.

FIG. 12 shows an example of the configuration of the resource block when the number of symbols is 3 and the number of subcarriers is 24. In this case, the band of one subcarrier is 7.5 kHz, and the symbol length of one symbol is 5120 Ts. That is, in the example shown in FIG. 12, the minimum unit to which the filter is applied is 7.5 kHz × 5120 Ts.

Note that the example described above is merely an example, and the application unit of the filter is not necessarily illustrated if the minimum time-frequency unit used for transmission is determined to be the minimum unit to which the filter is applied. The present invention is not limited to the example described with reference to FIGS. For example, depending on the modulation method, it may be assumed that a plurality of sub-symbols are defined by further dividing one symbol. In this case, for example, 1 subcarrier × 1 subsymbol may be the minimum unit to which the filter is applied.

(4) Method for Determining Application Unit of Filter Next, an example of a method for determining the application unit of the filter will be described. As for the application unit of the filter, there are a case where a predetermined application unit is fixedly used (that is, a fixed case) and a case that can be changed according to the situation (that is, a variable case). In addition, examples of cases where the application unit of the filter is variable include a case where the application unit is determined semi-statically and a case where the application unit is dynamically determined. Therefore, in the following, each of the case where the filter application unit is fixed, the case where it is determined semi-statically, and the case where it is dynamically determined will be described in detail.

(A) Case of fixing application unit of filter First, a case of fixing the application unit of filter will be described. In the case where the application unit of the filter is fixed, the application unit of the filter is determined as a specification (for example, communication protocol, etc.), and the base station and the terminal device are configured for each unit based on the specification with respect to the transmission signal. Apply a filter. For example, Table 1 below shows an example of the setting (specification) of the filter application unit when LTE is taken as an example. In Table 1, “Application Unit” indicates a unit to which a filter is applied, that is, corresponds to a filter application unit.

In Table 1, the example shown as Type 0 to 17 shows an example of the setting when the filter is applied over the entire bandwidth (Band Width) for each symbol (or for each sub-symbol). . On the other hand, the example shown as Type 18 to 20 shows an example in which the filter is applied in a finer unit in the frequency direction than the example shown as Type 0 to 17.

Note that the information indicating the filter application unit as shown in Table 1 is stored in a storage area (for example, the storage unit 140 or the storage unit 230) that can be read by each of the base station and the terminal device. Good. As another example, the base station may read information indicating the application unit of the filter from a predetermined storage area, and notify the terminal device of information related to the application unit according to the read result.

(B) Case where filter application unit is determined semi-statically Next, a case where a filter application unit is determined semi-statically will be described. In the case where the filter application unit is determined semi-statically, setting candidates that can be taken as filter application units are defined in advance between the base station and the terminal device. Then, for example, the base station determines the application unit of the filter from predetermined candidates based on a predetermined condition, and the terminal device transmits information on the determined application unit (in other words, information on the resource to which the filter is applied). Notify For example, Table 2 below shows an example of a candidate for application unit of the filter.

Note that the information indicating the candidates for the application unit of the filter as shown in Table 2 is stored in a storage area (for example, the storage unit 140 or the storage unit 230) that can be read by each of the base station and the terminal device. It is good to leave. As another example, the terminal device may recognize the candidate for the application unit of the filter by notifying the terminal device of information indicating the candidate for the application unit of the filter from the base station.

Next, attention is focused on the criteria for determining the application unit of the filter. Examples of criteria for determining the filter application unit include the following examples.
-System bandwidth-Feedback of communication quality from the terminal device-Retransmission request from the terminal device-Location information of the terminal device-Usage of the terminal device (requires communication quality from the terminal device)
・ Requests related to switching of application units of filters from terminal devices

Specifically, the base station determines the application unit of the filter within the bandwidth that can be used by the system.

In addition, since the base station can recognize the channel state based on the communication quality feedback from the terminal device, the base station can determine the application unit of the filter according to the recognition result of the channel state. Good. As a more specific example, when the channel state is deteriorated, it is assumed that the base station allocates a frequency with a better channel state to the terminal device. However, under conditions where the channel condition is degraded, the frequency with better channel condition is limited, and a range of usable frequencies may be assumed to be narrower. In such a case, the base station may narrow the frequency to be allocated to the terminal device, and may determine the filter application unit according to the frequency allocation. By such control, it becomes possible to suppress the reduction of the throughput of the terminal device and to secure a frequency that can be used by other terminal devices, and as a result, to improve the throughput of the entire system. .

Also, the case where the application unit of the filter is determined based on the retransmission request of the terminal device and the position information of the terminal device is the same as the case where the application unit of the filter is determined based on the communication quality feedback from the terminal device. For example, when there is a retransmission request from the terminal device, there is a possibility that the channel state is degraded. Also, depending on the position of the terminal device, the propagation distance between the base station and the terminal device may be longer, and under such circumstances, the channel state may be degraded. . As described above, when the channel state is degraded, the base station can narrow the frequency to be allocated to the terminal device and determine the application unit of the filter according to the frequency allocation, as described above. Good.

Also, depending on the usage of the terminal device, it may be assumed that the communication quality required by the terminal device is different. For example, depending on the usage of the terminal device, when the packet size may be small or the frequency band allocated to the terminal device may be relatively narrow, such as when the latency can be allowed There is. On the other hand, when the bucket size is larger or when low latency communication is required, it may be desirable to allocate a wider frequency band to the terminal device. Assuming such a situation, for example, the base station determines a bandwidth of a frequency to be allocated to the terminal device in response to a request regarding communication quality from the terminal device (for example, QoS: Quality of Service), and The application unit of the filter may be determined according to the width.

In addition, when the base station receives a request for switching the application unit of the filter from the terminal device, the base station may switch the application unit of the filter according to the request. In this case, for example, the base station assigns a channel to the terminal device according to the state of the channel with the terminal device, the communication quality required by the terminal device, and the like. The application unit of the filter may be determined.

In addition, when the base unit determines the application unit of the filter (when switched), the base station notifies the terminal device of information regarding the determined application unit. The information notified from the base station to the terminal includes, for example, information indicating the application unit of the filter itself (that is, the number of subcarriers or symbols to which the filter is applied) and the index value associated with the application unit. Etc.

Next, attention is focused on a method of notifying the terminal device of information indicating the unit of filter application from the base station. Examples of the method for notifying information indicating the application unit of the filter include the following examples.
Notify as part of RRC Signaling (RRC Message) Notify as part of System Information Notify as part of DCI (Downlink Control Information)

With the configuration as described above, it is possible to switch the application unit of the filter according to the situation. In addition, even when the application unit of the filter is switched, the terminal device can recognize the applied unit after the switching based on the notification from the base station. In other words, the terminal device can recognize the resource to which the filter is applied according to the applied unit of the filter after switching based on the notification from the base station.

In the above-described example, the case where the base station determines the application unit of the filter has been described. However, the subject that determines the application unit of the filter is not necessarily limited to the base station. As a specific example, the terminal device may determine an application unit of the filter. In this case, for example, the terminal device may notify the base station of information indicating the determined filter application unit as part of RRC Signaling or UCI (Uplink Control Information).

(C) Case in which filter application unit is dynamically determined Next, a case in which the filter application unit is dynamically determined will be described. In this case, for example, the base station determines the application unit based on a predetermined condition, that is, a predetermined criterion for determining the filter application unit. Examples of information for determining the application unit of the filter include the number of subcarriers to which the filter is applied and the number of symbols to which the filter is applied (or the number of subsymbols).

As for the criteria for determining the filter application unit, the following examples can be given as in the case of determining the filter application unit quasi-statically.
-System bandwidth-Feedback of communication quality from the terminal device-Retransmission request from the terminal device-Location information of the terminal device-Usage of the terminal device (requires communication quality from the terminal device)
・ Requests related to switching of application units of filters from terminal devices

In addition, regarding the method of notifying the terminal device of information indicating the filter application unit (in other words, information regarding the resource to which the filter is applied), the above-described filter application unit is quasi-statically determined. Similar to the case, the following examples are given.
Notify as part of RRC Signaling (RRC Message) Notify as part of System Information Notify as part of DCI

Also, the terminal device may determine the application unit of the filter. In this case, for example, the terminal device may notify the base station of information indicating the determined filter application unit as part of RRC Signaling or UCI (Uplink Control Information).

With the configuration as described above, it is possible to switch the application unit of the filter more flexibly according to the situation. In addition, even when the application unit of the filter is switched, the terminal device can recognize the applied unit after the switching based on the notification from the base station.

(5) Filter Application Unit Switching Timing Next, an example of the filter application unit switching timing will be described. For example, the base station may switch the filter application unit for each data to be transmitted, but may determine the switchable timing and switch the filter application unit based on the determination result.

Examples of the timing at which the base station switches the filter application unit include the following examples.
・ Switching based on feedback on communication quality from terminal devices ・ Switching at predetermined timing (for example, every frame)
・ Switching at the timing of retransmission

That is, the base station may determine the timing for switching the filter application unit based on the above-described conditions, and may switch the filter application unit at the timing based on the determination result.

As another example, the base station may notify the terminal device that it is possible to switch the application unit of the filter based on the determination result of the timing of switching the application unit of the filter. In addition, when the terminal device receives a notification from the base station of the timing at which the filter application unit can be switched, the terminal device determines whether it is necessary to switch the filter application unit. When the terminal device determines that the switching of the filter application unit is necessary, the terminal device notifies the base station of a request for switching the filter application unit. In this case, the base station may switch the application unit of the filter in response to a request from the terminal device.

Examples of the timing at which the terminal device requests the base station to switch the filter application unit include the following examples.
・ Notify when the measurement result of communication quality is below the threshold ・ Notify when a decoding error occurs

In the above, an example of the timing for switching the application unit of the filter has been described. An example of the flow of processing relating to switching of the application unit of the filter will be described later.

(6) Process Flow Next, an example of a process flow of the system according to the present embodiment will be described with reference to FIGS. 13 and 14.

(A) Process related to determination of filter application unit First, an example of a flow of a series of processes related to determination of a filter application unit will be described with reference to FIG. FIG. 13 is a flowchart illustrating an example of a flow of a series of processes related to determination of a filter application unit. In this description, it is assumed that the base station 100 determines a filter application unit.

First, the base station 100 (communication processing unit 151) determines whether or not to apply a filter for further limiting the frequency bandwidth used as a guard band to the transmission signal (S101). When it is determined that the filter is not applied (S101, NO), the base station 100 ends a series of processes related to determination of the filter application unit.

If it is determined that the filter is to be applied (S101, YES), the base station 100 (communication processing unit 151) confirms the minimum unit to which the filter is applied (S103). The minimum unit to which the filter is applied is as described above.

Next, the base station 100 (communication processing unit 151) determines an application unit of the filter. Specifically, when the application unit of the filter is fixed (S105, YES), the base station 100 follows the application unit based on the specification (communication protocol) and the unit corresponding to the application unit for the transmission signal. A filter is applied every time (S107).

When the application unit of the filter is determined semi-statically (S105, NO and S109, YES), the base station 100 (communication processing unit 151) determines the filter application unit based on a predetermined condition. Select from predetermined candidates. Then, the base station 100 applies a filter for each unit corresponding to the selected filter application unit for the transmission signal.

When the filter application unit is dynamically determined (S109, NO), the base station 100 (communication processing unit 151) dynamically determines the filter application unit based on a predetermined condition. Then, the base station 100 applies a filter for each unit corresponding to the determined filter application unit for the transmission signal.

As described above, with reference to FIG. 13, an example of a flow of a series of processes related to determination of a filter application unit has been described.

(B) Process related to filter application unit switching Next, an example of a flow of a series of processes related to filter application unit switching will be described with reference to FIG. FIG. 14 is a flowchart illustrating an example of a flow of a series of processes related to switching of application units of filters. In the description, it is assumed that the base station 100 switches the application unit of the filter. That is, in the figure, the subject of processing indicated by reference numerals S201 to S205 and S213 is the base station 100, and the subject of processing indicated by reference numerals S207 to S211 is the terminal device 200.

First, the base station 100 (communication processing unit 151) checks whether or not it is the timing when the application unit of the filter can be switched (S201). When it is not the timing when the application unit of the filter can be switched (S201, NO), the application unit of the filter is not switched, and the series of processing ends.

In addition, when it is the timing when the application unit of the filter can be switched (S201, YES), the base station 100 (communication processing unit 151) confirms whether or not it is time to switch the application unit of the filter (S203). ). In the case where it is necessary to switch the application unit of the filter (S203, YES), the base station 100 (communication processing unit 151) determines the application unit of the filter based on a predetermined condition. Then, the base station 100 (notifying unit 153) notifies the terminal device 200 of information regarding the determined filter application unit (S213).

On the other hand, if it is determined that it is not necessary to switch the filter application unit (S203, NO), the base station 100 (notification unit 153) indicates that the filter application unit can be switched. The device 200 is notified (S205). Upon receiving this notification, the terminal device 200 (communication processing unit 243) determines whether or not to make a request for switching the filter application unit to the base station 100 based on a predetermined condition (S207). Note that if the terminal device 200 determines not to make a request for switching the filter application unit (S209, NO), the filter application unit is not switched, and the series of processing ends.

If it is determined that a request for switching the application unit of the filter is made (S209, YES), the terminal device 200 (notification unit 245) makes a request for switching the application unit of the filter to the base station 100. Notice. Upon receiving this notification, the base station 100 (communication processing unit 151) determines a filter application unit based on a predetermined condition. Then, the base station 100 (notifying unit 153) notifies the terminal device 200 of information regarding the determined filter application unit (S213).

Also, the terminal device 200 (information acquisition unit 241) receives a notification of information related to a filter application unit from the base station 100. Accordingly, since the terminal device 200 (communication processing unit 243) can recognize the application unit of the filter applied to the signal transmitted from the base station 100, it is transmitted from the base station 100. It becomes possible to correctly decode the signal. Further, the terminal device 200 (information acquisition unit 241) may apply a filter to a signal to be transmitted to the base station 100 in application units corresponding to information notified from the base station 100. Thereby, the base station 100 can correctly decode the signal transmitted from the terminal device 200.

As described above, an example of a flow of a series of processes related to switching of the application unit of the filter has been described with reference to FIG.

<< 4. Application example >>
The technology according to the present disclosure can be applied to various products. For example, the base station 100 may be realized as any type of eNB (evolved Node B) such as a macro eNB or a small eNB. The small eNB may be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, a micro eNB, or a home (femto) eNB. Instead, the base station 100 may be realized as another type of base station such as a NodeB or a BTS (Base Transceiver Station). Base station 100 may include a main body (also referred to as a base station apparatus) that controls radio communication, and one or more RRHs (Remote Radio Heads) that are arranged at locations different from the main body. Further, various types of terminals described later may operate as the base station 100 by temporarily or semi-permanently executing the base station function. Furthermore, at least some components of the base station 100 may be realized in a base station apparatus or a module for the base station apparatus.

Further, for example, the terminal device 200 is a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a portable / dongle type mobile router or a digital camera, or an in-vehicle terminal such as a car navigation device. It may be realized as. The terminal device 200 may be realized as a terminal (also referred to as an MTC (Machine Type Communication) terminal) that performs M2M (Machine To Machine) communication. Furthermore, at least some of the components of the terminal device 200 may be realized in a module (for example, an integrated circuit module configured by one die) mounted on these terminals.

<4.1. Application examples for base stations>
(First application example)
FIG. 15 is a block diagram illustrating a first example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied. The eNB 800 includes one or more antennas 810 and a base station device 820. Each antenna 810 and the base station apparatus 820 can be connected to each other via an RF cable.

Each of the antennas 810 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission and reception of radio signals by the base station apparatus 820. The eNB 800 includes a plurality of antennas 810 as illustrated in FIG. 15, and the plurality of antennas 810 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. Although FIG. 15 illustrates an example in which the eNB 800 includes a plurality of antennas 810, the eNB 800 may include a single antenna 810.

The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

The controller 821 may be a CPU or a DSP, for example, and operates various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821 may generate a bundled packet by bundling data from a plurality of baseband processors, and may transfer the generated bundled packet. In addition, the controller 821 is a logic that executes control such as radio resource control, radio bearer control, mobility management, inflow control, or scheduling. May have a typical function. Moreover, the said control may be performed in cooperation with a surrounding eNB or a core network node. The memory 822 includes RAM and ROM, and stores programs executed by the controller 821 and various control data (for example, terminal list, transmission power data, scheduling data, and the like).

The network interface 823 is a communication interface for connecting the base station device 820 to the core network 824. The controller 821 may communicate with the core network node or other eNB via the network interface 823. In that case, the eNB 800 and the core network node or another eNB may be connected to each other by a logical interface (for example, an S1 interface or an X2 interface). The network interface 823 may be a wired communication interface or a wireless communication interface for wireless backhaul. When the network interface 823 is a wireless communication interface, the network interface 823 may use a frequency band higher than the frequency band used by the wireless communication interface 825 for wireless communication.

The wireless communication interface 825 supports any cellular communication scheme such as LTE (Long Term Evolution) or LTE-Advanced, and provides a wireless connection to terminals located in the cell of the eNB 800 via the antenna 810. The wireless communication interface 825 may typically include a baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor 826 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control), and PDCP). Various signal processing of (Packet Data Convergence Protocol) is executed. The BB processor 826 may have some or all of the logical functions described above instead of the controller 821. The BB processor 826 may be a module that includes a memory that stores a communication control program, a processor that executes the program, and related circuits. The function of the BB processor 826 may be changed by updating the program. Good. Further, the module may be a card or a blade inserted into a slot of the base station apparatus 820, or a chip mounted on the card or the blade. On the other hand, the RF circuit 827 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a radio signal via the antenna 810.

The wireless communication interface 825 includes a plurality of BB processors 826 as illustrated in FIG. 15, and the plurality of BB processors 826 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. Further, the wireless communication interface 825 includes a plurality of RF circuits 827 as illustrated in FIG. 15, and the plurality of RF circuits 827 may respectively correspond to a plurality of antenna elements, for example. 15 illustrates an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827. But you can.

In the eNB 800 illustrated in FIG. 15, one or more components (the transmission processing unit 151 and / or the notification unit 153) included in the processing unit 150 described with reference to FIG. 4 are implemented in the wireless communication interface 825. Also good. Alternatively, at least some of these components may be implemented in the controller 821. As an example, the eNB 800 includes a module including a part (for example, the BB processor 826) or all of the wireless communication interface 825 and / or the controller 821, and the one or more components are mounted in the module. Good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). The program may be executed. As another example, a program for causing a processor to function as the one or more components is installed in the eNB 800, and the radio communication interface 825 (eg, the BB processor 826) and / or the controller 821 executes the program. Good. As described above, the eNB 800, the base station apparatus 820, or the module may be provided as an apparatus including the one or more components, and a program for causing a processor to function as the one or more components is provided. May be. In addition, a readable recording medium in which the program is recorded may be provided.

Further, in the eNB 800 illustrated in FIG. 15, the wireless communication unit 120 described with reference to FIG. 4 may be implemented in the wireless communication interface 825 (for example, the RF circuit 827). Further, the antenna unit 110 may be mounted on the antenna 810. The network communication unit 130 may be implemented in the controller 821 and / or the network interface 823. In addition, the storage unit 140 may be implemented in the memory 822.

(Second application example)
FIG. 16 is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied. The eNB 830 includes one or more antennas 840, a base station apparatus 850, and an RRH 860. Each antenna 840 and RRH 860 may be connected to each other via an RF cable. Base station apparatus 850 and RRH 860 can be connected to each other via a high-speed line such as an optical fiber cable.

Each of the antennas 840 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of radio signals by the RRH 860. The eNB 830 includes a plurality of antennas 840 as illustrated in FIG. 16, and the plurality of antennas 840 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 16 shows an example in which the eNB 830 includes a plurality of antennas 840, but the eNB 830 may include a single antenna 840.

The base station device 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG.

The wireless communication interface 855 supports a cellular communication method such as LTE or LTE-Advanced, and provides a wireless connection to a terminal located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840. The wireless communication interface 855 may typically include a BB processor 856 and the like. The BB processor 856 is the same as the BB processor 826 described with reference to FIG. 15 except that the BB processor 856 is connected to the RF circuit 864 of the RRH 860 via the connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as illustrated in FIG. 16, and the plurality of BB processors 856 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 16 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.

The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH 860. The connection interface 857 may be a communication module for communication on the high-speed line that connects the base station apparatus 850 (wireless communication interface 855) and the RRH 860.

In addition, the RRH 860 includes a connection interface 861 and a wireless communication interface 863.

The connection interface 861 is an interface for connecting the RRH 860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication on the high-speed line.

The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may typically include an RF circuit 864 and the like. The RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 16, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements, respectively. 16 illustrates an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.

In the eNB 830 illustrated in FIG. 16, one or more components (the transmission processing unit 151 and / or the notification unit 153) included in the processing unit 150 described with reference to FIG. 4 include the wireless communication interface 855 and / or the wireless The communication interface 863 may be implemented. Alternatively, at least some of these components may be implemented in the controller 851. As an example, the eNB 830 includes a module including a part (for example, the BB processor 856) or the whole of the wireless communication interface 855 and / or the controller 851, and the one or more components are mounted in the module. Good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). The program may be executed. As another example, a program for causing a processor to function as the one or more components is installed in the eNB 830, and the wireless communication interface 855 (eg, the BB processor 856) and / or the controller 851 executes the program. Good. As described above, the eNB 830, the base station apparatus 850, or the module may be provided as an apparatus including the one or more components, and a program for causing a processor to function as the one or more components is provided. May be. In addition, a readable recording medium in which the program is recorded may be provided.

In the eNB 830 illustrated in FIG. 16, for example, the wireless communication unit 120 described with reference to FIG. 4 may be implemented in the wireless communication interface 863 (for example, the RF circuit 864). The antenna unit 110 may be mounted on the antenna 840. The network communication unit 130 may be implemented in the controller 851 and / or the network interface 853. The storage unit 140 may be mounted in the memory 852.

<4.2. Application examples related to terminal devices>
(First application example)
FIG. 17 is a block diagram illustrating an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, one or more antenna switches 915. One or more antennas 916, a bus 917, a battery 918 and an auxiliary controller 919 are provided.

The processor 901 may be, for example, a CPU or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900. The memory 902 includes a RAM and a ROM, and stores programs executed by the processor 901 and data. The storage 903 can include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.

The camera 906 includes, for example, an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. The sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor. The microphone 908 converts sound input to the smartphone 900 into an audio signal. The input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button, or a switch, and receives an operation or information input from a user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900. The speaker 911 converts an audio signal output from the smartphone 900 into audio.

The wireless communication interface 912 supports any cellular communication method such as LTE or LTE-Advanced, and performs wireless communication. The wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like. The BB processor 913 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 916. The wireless communication interface 912 may be a one-chip module in which the BB processor 913 and the RF circuit 914 are integrated. The wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as illustrated in FIG. FIG. 17 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914. However, the wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914. But you can.

Furthermore, the wireless communication interface 912 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a wireless LAN (Local Area Network) method in addition to the cellular communication method. In that case, a BB processor 913 and an RF circuit 914 for each wireless communication method may be included.

Each of the antenna switches 915 switches the connection destination of the antenna 916 among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 912.

Each of the antennas 916 includes a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of a radio signal by the radio communication interface 912. The smartphone 900 may include a plurality of antennas 916 as illustrated in FIG. Note that although FIG. 17 illustrates an example in which the smartphone 900 includes a plurality of antennas 916, the smartphone 900 may include a single antenna 916.

Furthermore, the smartphone 900 may include an antenna 916 for each wireless communication method. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. . The battery 918 supplies electric power to each block of the smartphone 900 shown in FIG. 17 through a power supply line partially shown by a broken line in the drawing. For example, the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode.

In the smartphone 900 illustrated in FIG. 17, one or more components (the information acquisition unit 241, the communication processing unit 243, and / or the notification unit 245) included in the processing unit 240 described with reference to FIG. The communication interface 912 may be implemented. Alternatively, at least some of these components may be implemented in the processor 901 or the auxiliary controller 919. As an example, the smartphone 900 includes a module including a part (for example, the BB processor 913) or the whole of the wireless communication interface 912, the processor 901, and / or the auxiliary controller 919, and the one or more components in the module. May be implemented. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). The program may be executed. As another example, a program for causing a processor to function as the one or more components is installed in the smartphone 900, and the wireless communication interface 912 (eg, the BB processor 913), the processor 901, and / or the auxiliary controller 919 is The program may be executed. As described above, the smartphone 900 or the module may be provided as a device including the one or more components, and a program for causing a processor to function as the one or more components may be provided. In addition, a readable recording medium in which the program is recorded may be provided.

Further, in the smartphone 900 illustrated in FIG. 17, for example, the wireless communication unit 220 described with reference to FIG. 5 may be implemented in the wireless communication interface 912 (for example, the RF circuit 914). The antenna unit 210 may be mounted on the antenna 916. The storage unit 230 may be mounted in the memory 902.

(Second application example)
FIG. 18 is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication. The interface 933 includes one or more antenna switches 936, one or more antennas 937, and a battery 938.

The processor 921 may be a CPU or SoC, for example, and controls the navigation function and other functions of the car navigation device 920. The memory 922 includes RAM and ROM, and stores programs and data executed by the processor 921.

The GPS module 924 measures the position (for example, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites. The sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor. The data interface 926 is connected to the in-vehicle network 941 through a terminal (not shown), for example, and acquires data generated on the vehicle side such as vehicle speed data.

The content player 927 reproduces content stored in a storage medium (for example, CD or DVD) inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and receives an operation or information input from the user. The display device 930 has a screen such as an LCD or an OLED display, and displays a navigation function or an image of content to be reproduced. The speaker 931 outputs the navigation function or the audio of the content to be played back.

The wireless communication interface 933 supports any cellular communication method such as LTE or LTE-Advanced, and performs wireless communication. The wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like. The BB processor 934 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for wireless communication. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a radio signal via the antenna 937. The wireless communication interface 933 may be a one-chip module in which the BB processor 934 and the RF circuit 935 are integrated. The wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935 as shown in FIG. 18 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. But you can.

Further, the wireless communication interface 933 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a wireless LAN method in addition to the cellular communication method. A BB processor 934 and an RF circuit 935 may be included for each communication method.

Each of the antenna switches 936 switches the connection destination of the antenna 937 among a plurality of circuits included in the wireless communication interface 933 (for example, circuits for different wireless communication systems).

Each of the antennas 937 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of a radio signal by the radio communication interface 933. The car navigation device 920 may include a plurality of antennas 937 as shown in FIG. 18 illustrates an example in which the car navigation apparatus 920 includes a plurality of antennas 937, the car navigation apparatus 920 may include a single antenna 937.

Furthermore, the car navigation device 920 may include an antenna 937 for each wireless communication method. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.

The battery 938 supplies power to each block of the car navigation apparatus 920 shown in FIG. 18 through a power supply line partially shown by a broken line in the figure. Further, the battery 938 stores electric power supplied from the vehicle side.

In the car navigation device 920 shown in FIG. 18, one or more components (information acquisition unit 241, communication processing unit 243, and / or notification unit 245) included in the processing unit 240 described with reference to FIG. The wireless communication interface 933 may be implemented. Alternatively, at least some of these components may be implemented in the processor 921. As an example, the car navigation apparatus 920 includes a module including a part (for example, the BB processor 934) or the whole of the wireless communication interface 933 and / or the processor 921, and the one or more components are mounted in the module. May be. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). The program may be executed. As another example, a program for causing a processor to function as the one or more components is installed in the car navigation device 920, and the wireless communication interface 933 (eg, the BB processor 934) and / or the processor 921 executes the program. May be. As described above, the car navigation apparatus 920 or the module may be provided as an apparatus including the one or more components, and a program for causing a processor to function as the one or more components may be provided. Good. In addition, a readable recording medium in which the program is recorded may be provided.

In the car navigation device 920 shown in FIG. 18, for example, the wireless communication unit 220 described with reference to FIG. 5 may be implemented in the wireless communication interface 933 (for example, the RF circuit 935). The antenna unit 210 may be mounted on the antenna 937. Further, the storage unit 230 may be implemented in the memory 922.

Also, the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle side module 942. That is, the in-vehicle system (or vehicle) 940 may be provided as a device including the information acquisition unit 241, the communication processing unit 243, and / or the notification unit 245. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.

<< 5. Conclusion >>
The embodiment of the present disclosure has been described in detail above with reference to FIGS. As described above, the base station 100 according to the present embodiment notifies the terminal device 200 of control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for wireless communication is applied. To do. More specifically, the application unit of the filter is determined with the resource element as the minimum unit. And the information regarding the determined application unit of a filter is notified to the terminal device 200 from the base station 100, for example.

In addition, when each of the base station 100 and the terminal device 200 operates as a transmission device, the transmission device transmits the filter based on control information related to a resource to which a filter for limiting the width of the guard band is applied. Applies to data (ie, transmitted signal). Then, the transmission device transmits the transmission data after applying the filter to the external device that is the transmission destination.

With the configuration as described above, according to the system according to the present embodiment, the resource (in other words, the filter application unit) to which the filter for limiting the width of the guard band is applied depends on the transmission / reception environment and use case. Thus, it becomes possible to select or determine adaptively. As a result, the filter can be applied to the transmission data in a more preferable manner, and as a result, the throughput of the entire system is expected to be improved.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present disclosure can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present disclosure.

In addition, the effects described in the present specification are merely illustrative or illustrative, and are not limited. That is, the technology according to the present disclosure can exhibit other effects that are apparent to those skilled in the art from the description of the present specification in addition to or instead of the above effects.

The following configurations also belong to the technical scope of the present disclosure.
(1)
A communication unit for performing wireless communication;
A control unit for controlling control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is transmitted to an external device via the wireless communication;
An apparatus comprising:
(2)
The control unit determines a unit to apply the filter using the resource as a minimum unit, and information related to the unit is transmitted to the external apparatus via the wireless communication as control information related to the resource. The apparatus according to (1), which is controlled.
(3)
The apparatus according to (2), wherein the unit is determined based on the number of resources in at least one of a frequency direction and a time direction.
(4)
A storage unit for storing the control information;
The control unit performs control so that the control information stored in the storage unit is transmitted to the external device via the wireless communication, according to any one of (1) to (3). Equipment.
(5)
The apparatus according to (1), wherein the control unit determines a resource to which the filter is applied based on a predetermined condition.
(6)
The said control part is an apparatus as described in said (5) which determines the resource which applies the said filter from several preset candidates based on the said predetermined conditions.
(7)
The device according to (5) or (6), wherein the control unit determines a resource to which the filter is applied after receiving a request regarding the resource to which the filter is applied from the external device.
(8)
The control unit, according to at least one of feedback of communication quality from the external device, retransmission request from the external device, location information of the external device, and request regarding communication quality from the external device The apparatus according to any one of (5) to (7), wherein a resource to which a filter is applied is determined.
(9)
The control unit according to any one of (1) to (8), wherein the control unit controls information related to timing of switching a resource to which the filter is applied to be transmitted to the external device via the wireless communication. The device described.
(10)
The apparatus according to (2) or (3), wherein the control unit determines the unit to apply the filter based on a predetermined condition.
(11)
The apparatus according to (10), wherein the control unit determines the unit to apply the filter from a plurality of preset candidates based on the predetermined condition.
(12)
The said control part is an apparatus as described in said (10) or (11) which determines the said unit which applies the said filter after receiving the request regarding the said unit which applies the said filter from the said external device.
(13)
The control unit, according to at least one of feedback of communication quality from the external device, retransmission request from the external device, location information of the external device, and request regarding communication quality from the external device The apparatus according to any one of (10) to (12), wherein the unit to which a filter is applied is determined.
(14)
The control unit controls the information related to the timing of switching the unit to which the filter is applied to be transmitted to the external apparatus via the wireless communication. (2), 3, 10 to (13) The device according to any one of the above.
(15)
A communication unit for performing wireless communication;
An acquisition unit that acquires control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is applied from the external device via the wireless communication;
An apparatus comprising:
(16)
The apparatus according to (15), further including a control unit configured to control so that a request regarding switching of a resource to which the filter is applied is transmitted to the external apparatus via the wireless communication according to a predetermined condition.
(17)
The device according to (16), wherein the control unit controls the request to be transmitted to the external device via the wireless communication in accordance with the quality of the wireless communication.
(18)
The control unit controls the request to be transmitted to the external device via the wireless communication in accordance with a decoding result of data received from the external device via the wireless communication. ) Device.
(19)
A communication unit for performing wireless communication;
Based on control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is applied, the filter is applied to transmission data, and the transmission data to which the filter is applied is A control unit for controlling to be transmitted to an external device via the wireless communication;
An apparatus comprising:
(20)
Doing wireless communication,
The processor controls so that control information related to a resource to which a filter for limiting the width of a guard band out of the frequency band used for the wireless communication is transmitted to the external device via the wireless communication. When,
Including a method.
(21)
Doing wireless communication,
A processor acquires control information regarding a resource to which a filter for limiting a guard band width is used from among the frequency bands used for the wireless communication from an external device via the wireless communication;
Including a method.
(22)
Doing wireless communication,
The processor applies the filter to transmission data based on control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is applied, and the filter to which the filter is applied Controlling transmission data to be transmitted to an external device via the wireless communication;
Including a method.

1 system 10 cell 100 base station 110 antenna unit 120 wireless communication unit 130 network communication unit 140 storage unit 150 processing unit 151 communication processing unit 153 notification unit 200 terminal device 210 antenna unit 220 wireless communication unit 230 storage unit 240 processing unit 241 information acquisition Unit 243 communication processing unit 245 notification unit

Claims (22)

1. A communication unit for performing wireless communication;
   A control unit for controlling control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is transmitted to an external device via the wireless communication;
   An apparatus comprising:
2. The control unit determines a unit to apply the filter using the resource as a minimum unit, and information related to the unit is transmitted to the external apparatus via the wireless communication as control information related to the resource. The apparatus of claim 1, wherein the apparatus controls.
3. The apparatus according to claim 2, wherein the unit is determined based on the number of resources in at least one of a frequency direction and a time direction.
4. A storage unit for storing the control information;
   The apparatus according to claim 1, wherein the control unit controls the control information stored in the storage unit to be transmitted to the external device via the wireless communication.
5. The apparatus according to claim 1, wherein the control unit determines a resource to which the filter is applied based on a predetermined condition.
6. The apparatus according to claim 5, wherein the control unit determines a resource to which the filter is applied from a plurality of preset candidates based on the predetermined condition.
7. 6. The apparatus according to claim 5, wherein the control unit determines a resource to which the filter is applied after receiving a request regarding the resource to which the filter is applied from the external apparatus.
8. The control unit, according to at least one of feedback of communication quality from the external device, retransmission request from the external device, location information of the external device, and request regarding communication quality from the external device 6. The apparatus according to claim 5, wherein a resource to which a filter is applied is determined.
9. The apparatus according to claim 1, wherein the control unit controls information related to timing of switching a resource to which the filter is applied to be transmitted to the external apparatus via the wireless communication.
10. The apparatus according to claim 2, wherein the control unit determines the unit to apply the filter based on a predetermined condition.
11. The apparatus according to claim 10, wherein the control unit determines the unit to which the filter is applied from a plurality of preset candidates based on the predetermined condition.
12. The apparatus according to claim 10, wherein the control unit determines the unit to which the filter is applied after receiving a request regarding the unit to which the filter is applied from the external apparatus.
13. The control unit, according to at least one of feedback of communication quality from the external device, retransmission request from the external device, location information of the external device, and request regarding communication quality from the external device The apparatus of claim 10, wherein the unit for applying a filter is determined.
14. The apparatus according to claim 2, wherein the control unit controls information related to timing of switching the unit to which the filter is applied to be transmitted to the external apparatus via the wireless communication.
15. A communication unit for performing wireless communication;
    An acquisition unit that acquires control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is applied from the external device via the wireless communication;
    An apparatus comprising:
16. The apparatus according to claim 15, further comprising a control unit configured to control so that a request regarding switching of a resource to which the filter is applied is transmitted to the external apparatus via the wireless communication according to a predetermined condition.
17. The apparatus according to claim 16, wherein the control unit controls the request to be transmitted to the external apparatus via the wireless communication according to the quality of the wireless communication.
18. The control unit controls the request to be transmitted to the external device via the wireless communication according to a decoding result of data received from the external device via the wireless communication. The device described in 1.
19. A communication unit for performing wireless communication;
    Based on control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is applied, the filter is applied to transmission data, and the transmission data to which the filter is applied is A control unit for controlling to be transmitted to an external device via the wireless communication;
    An apparatus comprising:
20. Doing wireless communication,
    The processor controls so that control information related to a resource to which a filter for limiting the width of a guard band out of the frequency band used for the wireless communication is transmitted to the external device via the wireless communication. When,
    Including a method.
21. Doing wireless communication,
    A processor acquires control information regarding a resource to which a filter for limiting a guard band width is used from among the frequency bands used for the wireless communication from an external device via the wireless communication;
    Including a method.
22. Doing wireless communication,
    The processor applies the filter to transmission data based on control information related to a resource to which a filter for limiting the width of a guard band among frequency bands used for the wireless communication is applied, and the filter to which the filter is applied Controlling transmission data to be transmitted to an external device via the wireless communication;
    Including a method.

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